MIPS: Loongson: Add UEFI-like firmware interface (LEFI) support

The new UEFI-like firmware interface (LEFI, i.e. Loongson Unified
Firmware Interface) has 3 advantages:

1, Firmware export a physical memory map which is similar to X86's
   E820 map, so prom_init_memory() will be more elegant that #ifdef
   clauses can be removed.
2, Firmware export a pci irq routing table, we no longer need pci
   irq routing fixup in kernel's code.
3, Firmware has a built-in vga bios, and its address is exported,
   the linux kernel no longer need an embedded blob.

With the LEFI interface, Loongson-3A/2G and all their successors can use
a unified kernel. All Loongson-based machines support this new interface
except 2E/2F series.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Hongliang Tao <taohl@lemote.com>
Signed-off-by: Hua Yan <yanh@lemote.com>
Tested-by: Alex Smith <alex.smith@imgtec.com>
Reviewed-by: Alex Smith <alex.smith@imgtec.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/6632
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 54 insertions, 13 deletions

diff --git a/arch/mips/loongson/common/env.c b/arch/mips/loongson/common/env.c
index 0a18fcf2d372..0c543eae49bf 100644
--- a/arch/mips/loongson/common/env.c
+++ b/arch/mips/loongson/common/env.c
@@ -18,29 +18,30 @@
  * option) any later version.
  */
 #include <linux/module.h>
-
 #include <asm/bootinfo.h>
-
 #include <loongson.h>
+#include <boot_param.h>
 
-unsigned long cpu_clock_freq;
+u32 cpu_clock_freq;
 EXPORT_SYMBOL(cpu_clock_freq);
-unsigned long memsize, highmemsize;
+struct efi_memory_map_loongson *loongson_memmap;
+struct loongson_system_configuration loongson_sysconf;
 
 #define parse_even_earlier(res, option, p)				\
 do {									\
 	unsigned int tmp __maybe_unused;				\
 									\
 	if (strncmp(option, (char *)p, strlen(option)) == 0)		\
-		tmp = strict_strtol((char *)p + strlen(option"="), 10, &res); \
+		tmp = kstrtou32((char *)p + strlen(option"="), 10, &res); \
 } while (0)
 
 void __init prom_init_env(void)
 {
 	/* pmon passes arguments in 32bit pointers */
-	int *_prom_envp;
-	unsigned long bus_clock;
 	unsigned int processor_id;
+
+#ifndef CONFIG_LEFI_FIRMWARE_INTERFACE
+	int *_prom_envp;
 	long l;
 
 	/* firmware arguments are initialized in head.S */
@@ -48,7 +49,6 @@ void __init prom_init_env(void)
 
 	l = (long)*_prom_envp;
 	while (l != 0) {
-		parse_even_earlier(bus_clock, "busclock", l);
 		parse_even_earlier(cpu_clock_freq, "cpuclock", l);
 		parse_even_earlier(memsize, "memsize", l);
 		parse_even_earlier(highmemsize, "highmemsize", l);
@@ -57,8 +57,48 @@ void __init prom_init_env(void)
 	}
 	if (memsize == 0)
 		memsize = 256;
-	if (bus_clock == 0)
-		bus_clock = 66000000;
+	pr_info("memsize=%u, highmemsize=%u\n", memsize, highmemsize);
+#else
+	struct boot_params *boot_p;
+	struct loongson_params *loongson_p;
+	struct efi_cpuinfo_loongson *ecpu;
+	struct irq_source_routing_table *eirq_source;
+
+	/* firmware arguments are initialized in head.S */
+	boot_p = (struct boot_params *)fw_arg2;
+	loongson_p = &(boot_p->efi.smbios.lp);
+
+	ecpu = (struct efi_cpuinfo_loongson *)
+		((u64)loongson_p + loongson_p->cpu_offset);
+	eirq_source = (struct irq_source_routing_table *)
+		((u64)loongson_p + loongson_p->irq_offset);
+	loongson_memmap = (struct efi_memory_map_loongson *)
+		((u64)loongson_p + loongson_p->memory_offset);
+
+	cpu_clock_freq = ecpu->cpu_clock_freq;
+	loongson_sysconf.cputype = ecpu->cputype;
+	loongson_sysconf.nr_cpus = ecpu->nr_cpus;
+	if (ecpu->nr_cpus > NR_CPUS || ecpu->nr_cpus == 0)
+		loongson_sysconf.nr_cpus = NR_CPUS;
+
+	loongson_sysconf.pci_mem_start_addr = eirq_source->pci_mem_start_addr;
+	loongson_sysconf.pci_mem_end_addr = eirq_source->pci_mem_end_addr;
+	loongson_sysconf.pci_io_base = eirq_source->pci_io_start_addr;
+	loongson_sysconf.dma_mask_bits = eirq_source->dma_mask_bits;
+	if (loongson_sysconf.dma_mask_bits < 32 ||
+		loongson_sysconf.dma_mask_bits > 64)
+		loongson_sysconf.dma_mask_bits = 32;
+
+	loongson_sysconf.restart_addr = boot_p->reset_system.ResetWarm;
+	loongson_sysconf.poweroff_addr = boot_p->reset_system.Shutdown;
+	loongson_sysconf.suspend_addr = boot_p->reset_system.DoSuspend;
+
+	loongson_sysconf.ht_control_base = 0x90000EFDFB000000;
+	loongson_sysconf.vgabios_addr = boot_p->efi.smbios.vga_bios;
+	pr_debug("Shutdown Addr: %llx, Restart Addr: %llx, VBIOS Addr: %llx\n",
+		loongson_sysconf.poweroff_addr, loongson_sysconf.restart_addr,
+		loongson_sysconf.vgabios_addr);
+#endif
 	if (cpu_clock_freq == 0) {
 		processor_id = (&current_cpu_data)->processor_id;
 		switch (processor_id & PRID_REV_MASK) {
@@ -68,12 +108,13 @@ void __init prom_init_env(void)
 		case PRID_REV_LOONGSON2F:
 			cpu_clock_freq = 797000000;
 			break;
+		case PRID_REV_LOONGSON3A:
+			cpu_clock_freq = 900000000;
+			break;
 		default:
 			cpu_clock_freq = 100000000;
 			break;
 		}
 	}
-
-	pr_info("busclock=%ld, cpuclock=%ld, memsize=%ld, highmemsize=%ld\n",
-		bus_clock, cpu_clock_freq, memsize, highmemsize);
+	pr_info("CpuClock = %u\n", cpu_clock_freq);
 }